A few days ago I was listening to an interview on the radio, and the man said that Spain had a very inefficient food supply chain becuase the food would travel across provinces. He said that if the provinces would be able to self supply about 80-90% of their own food that would reduce massively the CO2 footprint. He gave some numbers which I don't remember, but they were quite massive.

Texas alone has a bigger surface than Spain, I wonder how much pollutes the transport of the food alone and how much could be avoided by producing food locally. The whole thing seems pretty wasteful...